Flexible tube.



no. 680,984. Pa tontod'Aug. 2o, ISOII;

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FLEXIBLE TUBE.

(Application flhfl In. 97,1900.)

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FFICE.

FATENT CHARLES T. SCHOEN, OF PHILADELPHIA, PENNSYLVANIA.

FLEXIBLE TUBE.

$PECIFIQATION forming part of Letters Patent No. 680,984, dated August 20, 1901.

Application filed March 27, 1900.

T o whom it may concern.-

Be it known'that 1, CHARLES T. SCHOEN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Flexia ble Tubes, of which the following is a full,

clear, and exact description.

This invention relates to flexible metallic tubes or tubing made up of a flanged strip spirally wound,with a packing-strip arranged between its interlocking flanges. It has been demonstrated that the power of resistance to pressure is materially increased if these flanges are reinforced, and it has been proposed to reinforce them by bending or folding the metal of the strip along its edges one or more times, leaving these bent edges free,

0r soldering, brazing, or welding them or forming them by rolling. I believe that the best results and a stronger tube are obtained if the strip be reinforced with rolled thickened edges, the greater thickness being disposed at the angle of the bend.

My invention therefore consists of a rolled tube-strip having its edges thickened and tion.

the bends or angles of greatest thickness; and the invention also consists of a flexible tube comprising a spirally-Wound strip of rolled metal, having its interlocking flanges rolled thicker than its body and of greatest thickness at their corners or bends, substan- Serial No. 10,379. (No model.)

thicker than its body, and these thickened portions may be on opposite sides of the blank, as in Fig. 3, or they may be on the same side, as in Fig. 4, or they may project from both sides, as in Fig. 5. The strip thus produced is given the profile suitable to make a flexible tube, and to this end its homogeneous thickened edges are bent as flanges, Figs.

1 and 2, which are interlocked with interposed packing a in any well-known way.

I do not limit my invention to the arrangement of the integral homogeneous thickened edges or to the manner of interlocking the flanges of the strip so long as the increase in thickness is at the weakest point. The gain in strength is mainly valuable at the corners or bends d d, Fig. 2, and hence I dispose the greater thickness of metal at such corners or angles.

The strength of the flanged strip when rolled with integral and homogeneous thick ened edges is greatly increased and the power to resist internal pressure is very perceptibly augmented.

What I claim is-- 1. A rolled-metal strip, for use in forming a flexible tube by spirally winding said strip, provided with integral, homogeneous, thickened flanges of greatest thickness at the corners or angles d, substantially as described.

2. A flexible tube, comprising a spirallywonnd metal strip, the edges of which are integrally and homogeneously thickened to form reinforced flanges and having their greatest thickness at the corners or angles, said flanges interlocking with interposed packing, substantially as described.

In testimony whereof I have hereunto set my hand this 24th day of March, A. D. 1900.

CHARLES T. SCHOEN.

Witnesses:

W. 0. DE ARMUND. WM. 0. KnAN, J r. 

